KORHAN M. ERTURAÇ, Okan TÜYSÜZ

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Kinematics and basin formation along the Ezinepazar-Sungurlu fault zone, NE Anatolia, Turkey

Ezinepazar-Sungurlu Fayı (EzSF), Kuzey Anadolu Fay (KAF) hattından ayrılan önemli bir yan koludur. Bu fay, Niksar yakınlarında (37°D) anakoldan ayrılarak Anadolu Blok’unun içlerine doğru, yaklaşık 200 km boyunca (34°D), belirgin olarak izlenir. EzSF’nin en doğu kesimi olan Ezinepazar Fayı (EzF) çarpıcı bir aktif fay morfolojisine sahiptir ve bu kol 1939 Erzincan (Mw= 7.8) depreminde tamamen kırılmıştır. Bu segmentin üzerinde gelişmiş havzalarda depolanan genç çökellerin mikromemeli yaşlandırması, fayın oluşumunun Orta Pleyistosen’de (0.7–1 My) başladığını göstermektedir ve bu dönem içerisinde doğuda en çok 6.5±0.5 km morfolojik ötelenme birikmiştir. EzSF’nin orta segmentini oluşturan Deliçay Fayı (DF), belirgin bir ‘en-échelon’ geometrisi sunarak dar bir dağ önü ovasının gelişimini kontrol etmiştir. DF ve batı devamı olan Geldingen Fayı (GF) arasında gerçekleşen sağ yönlü sıçrama ve ölçülen 3.5±1 km morfolojik atım, genç bir çek-ayır havzanın oluşumunu denetler. EzSF en batı kesiminde, Mecitözü Fayı (MF) ve Sungurlu Fayı (SF) olarak iki kola ayrılmaktadır. Bu faylar, mikromemeli fosilleri ile Geç Miyosen–Erken Pliyosen aralığında yaşlandırılan karasal bir çökel paketinin depolanmasını kontrol etmişlerdir. EzSF üzerinde bulunan havzaların Neojen–Kuvaterner stratigrafi si iki farklı evrede fay kontrollü havza oluşumunu işaret etmektedir. İlk dönem, Geç Miyosen–Erken Pliyosen döneminde aktif olmuştur. İkinci dönem, Ezinepazar Fayı’nın Orta Pleyistosen’deki oluşumuyla başlayarak, doğudan batıya doğru ilerlemesi sonucu görece eski tektonik hatları sağ yanal KAF sistemi içerisinde yeniden harekete geçirmesi ile tanımlanmışır. Fay üzerinde ölçülen morfolojik ötelenmelerin fay boyunca azalarak sistemin en batı kesiminde tamamen sonlanması, fayın üstündeki kayma hızının oluşumdan günümüze sabit olmadığını göstermektedir. Bu yorum GPS verileri ile desteklenmekte ve bölgenin deprem tehlike analizi çalışmaları için önem arzetmektedir.

Ezinepazar-Sungurlu fayının evrimi, kinematiği ve havza oluşumu, KD Anadolu, Türkiye

The Ezinepazar-Sungurlu Fault (EzSF) is a major off shoot of the dextral North Anatolian Fault (NAF) zone, which bifurcates from the main fault strand around the Niksar pull-apart basin (37°E) and strikes through the Central Anatolian Block for 200 km to the west (34°E). The easternmost segment of the EzSF, the Ezinepazar Fault (EzF), which ruptured during the 1939 Erzincan earthquake (Mw= 7.8), has a very remarkable expression as a single-strand fault. Micromammal dating of young sediments along this segment indicate that the EzF was initiated during the Middle Pleistocene (0.7–1 Ma) and propagated westward accumulating 6.5±0.5 km maximum morphological off set. The central segment of the EzSF, the Deliçay Fault (DF), is expressed as an en-échelon pattern and controlled the formation of a narrow fault-wedge basin (Aydınca Plain). The stepover between the DF and its western continuation, the Geldingen Fault (GF), forms a young pull-apart basin (Geldingen Basin) where the maximum morphological offset is measured at 3.5±1 km. In the westernmost part of the fault zone, the deformation zone widens and the EzSF bifurcates into the Mecitözü (MF) and the Sungurlu faults (SF). The MF controlled the deposition of continental clastics, dated as Late Miocene–Early Pliocene by using mammal chronology (MN13-14). The Neogene–Quaternary stratigraphy of the basins along the EzSF indicates two phases of faulting-related basin formation. The first period took part during the Late Miocene–Early Pliocene; the second phase started with the initiation of the EzF in the east during the Middle Pleistocene. The western propagation of the fault caused the reactivation of older tectonic lines as an element of the NAF system. The offset distribution measured along the EzSF shows that accumulated long-term slip is not uniform along the fault, as it decreases gradually where the fault becomes distant from the NAF main strand. This projection is applicable to present day slip rate distribution along the EzSF, which is shown also by GPS measurements and is therefore important for earthquake hazard estimates for the region.
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Turkish Journal of Earth Sciences-Cover
  • ISSN: 1300-0985
  • Yayın Aralığı: Yılda 6 Sayı
  • Yayıncı: TÜBİTAK
Arşiv
Sayıdaki Diğer Makaleler

Ezinepazar-Sungurlu Fayının Evrimi, Kinematiği ve Havza Oluşumu, KD Anadolu, Türkiye

M. KORHAN ERTURAÇ, & OKAN TÜYSÜZ

Kinematics and basin formation along the Ezinepazar-Sungurlu fault zone, NE Anatolia, Turkey

KORHAN M. ERTURAÇ, Okan TÜYSÜZ

The Palu-Uluova Strike-Slip Basin in the East Anatolian Fault System, Turkey: Its Transition from the Palaeotectonic to Neotectonic Stage

SERAP ÇOLAK, ERCAN AKSOY, ALİ KOÇYİĞİT & MURAT İNCEÖZ

An Active Composite Pull-apart Basin Within the Central Part of the North Anatolian Fault System: the Merzifon-Suluova Basin, Turkey

BORA ROJAY & ALİ KOÇYİĞİT

Neotectonic Evolution of an Actively Growing Superimposed Basin in Western Anatolia: The Inner Bay of İzmir, Turkey

BORA UZEL, HASAN SÖZBİLİR & ÇAĞLAR ÖZKAYMAK

Neotectonic Characteristics of the İnönü-Eskişehir Fault System in the Kaymaz (Eskişehir) Region: Influence on the Development of the Mahmudiye-Çifteler-Emirdağ Basin

AZAD SAĞLAM SELÇUK & YAŞAR ERGUN GÖKTEN